Final answer:
Janice and Caren can complete 2/3 of the job in 1 day.
Step-by-step explanation:
To find out how much of the job Janice and Caren can do in 1 day, we need to determine the fraction of the job that Sheila, Janice, and Katen can complete in 1 day.
Since they can complete the job in 3 1/3 days, they can complete 1/3 of the job in 1 day.
Since Sheila, Janice, and Katen are working at the same rate, each of them can complete 1/3 of the job in 1 day. Therefore, Janice and Caren working together can complete 2/3 of the job in 1 day.